PHASE 1: VISUAL DECONSTRUCTION - **Fabric Physics:** The source garment is a black, textured ribbed knit (likely cotton or jersey blend). It possesses a matte finish with low specular highlights. The physics engine must account for moderate stretch across the chest and a heavier vertical drape compared to the user's current lightweight t-shirt. - **Key Features:** The specific waffle/ribbed texture pattern must be preserved to distinguish it from a flat black surface. The deep scoop neckline and deep armholes (sleeveless cut) are critical geometry changes. The hemline stitching details must be retained. PHASE 2: FIT & DRAPE SIMULATION - **Body Mapping:** - **Sleeve Removal (Critical):** The user is currently wearing a short-sleeved t-shirt, while the target is a tank top. The simulation must in-paint/generate realistic skin texture and anatomical muscle definition (deltoids/traps) for the shoulders and upper arms where the white sleeves currently exist. - **Torso Wrap:** Since the user is in a 3/4 side profile, the tank top must wrap realistically around the latissimus dorsi. The fabric should stretch slightly across the pectorals due to the user's muscular build and drape vertically towards the waistline, likely bunching slightly above the belt line given the user's leaning posture. - **Occlusion Handling:** - The user's left forearm and hand (positioned near the waist) must layer *over* the garment if the hemline falls that low. - The yellow wristbands on the left wrist must be preserved and mask out the garment. - The car door frame (foreground) acts as a hard boundary; the garment must not bleed onto the car interior. PHASE 3: ENVIRONMENT & LIGHTING - **Light Match:** The user environment is outdoors with overcast, diffuse daylight (soft lighting with no harsh directional shadows). The black fabric must not be rendered as "pure black" but rather a dark charcoal with visible texture gradients reacting to the ambient skylight. - **Color Calibration:** The source image has warm studio lighting. This must be neutralized to match the cooler, desaturated tones of the outdoor environment. The black point of the tank top should match the black point of the car's window trim and tires to ensure scene integration. PHASE 4: IDENTITY PROTECTION - **Facial Lock:** The user's entire head region, including the beard, hairstyle, ear, and sunglasses, must be frozen and pixel-perfectly preserved. - **Body Integrity:** Strictly forbidden to slim the user's physique. The user has a muscular build; the new garment must conform to this volume, not reduce it. The generated skin for the shoulders must match the skin tone and muscularity of the visible forearm.